QPID-6224: [Java Broker] BDB / BDB-HA VH now cleans all log files and performs a BDB checkpoint.

* Cleaner thread is disabled whilst manually clean is in operation.

git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk@1638936 13f79535-47bb-0310-9956-ffa450edef68